Make server HTTPS

[alifeee]

It's currently HTTP. This means when embedded on HTTPS webpages, the collage counts as "mixed content".

Chrome does not allow mixed content by default.

I can use flask with HTTPS SSL keys, either with self-signed keys (bad) or with a key via Let's Encrypt.

[alifeee]

use instructions from https://gist.github.com/alifeee/92defe5a02a2e1dd17cb517135e80ffe

webring and server subdomains are HTTPS

[alifeee]

done, see https://gist.github.com/alifeee/92defe5a02a2e1dd17cb517135e80ffe for how